Emerson Bettis CBB Series Istruzioni operative

Service Instructions

137465E Rev. F

May 2012

CBB-Series Spring Return Pneumatic Actuators

Service Instructions

137465E Rev. F

Table of Contents

May 2012

Table of Contents

Section 1: Introduction

1.1 General service information .......................................................................... 1

1.2 Denitions .................................................................................................... 2

1.3 General safety information ............................................................................ 2

1.4 Bettis reference materials .............................................................................. 3

1.5 Service support items ................................................................................... 3

1.6 Lubrication requirements .............................................................................. 3

1.7 General tool information ............................................................................... 3

1.8 Actuator weight ............................................................................................ 4

Section 2: Actuator disassembly

2.1 General disassembly ...................................................................................... 5

2.2 Spring cylinder disassembly ........................................................................... 6

2.3 Housing disassembly ..................................................................................... 8

Section 3: Actuator reassembly

3.1 General reassembly ....................................................................................... 9

3.2 Housing reassembly .................................................................................... 10

3.3 Spring cylinder reassembly .......................................................................... 12

Section 4: Actuator Testing

4.1 Actuator testing .......................................................................................... 15

4.2 Return to service ......................................................................................... 16

4.3 Pressure requirement & limitations for CBB-SR actuators ............................. 16

Section 5: Document Revision ��17

Appendix A: List of Tables ��18

Appendix B: List of Drawings ��19

B.1 Part No. 152230, CBBXXX-SRX Assembly Dwg ............................................ 19

B.2 Part No. 152608, CBBXXX-SRX-M3HW Assembly Dwg ................................ 20

May 2012

Service Instructions

137465E Rev. F

Section 1: Introduction

Introduction

Section 1: Introduction

1�1 General service information

1.1.1 This service procedure is offered as a guide to enable general maintenance to be

performed on Bettis CBB-SR double acting series actuators.

The following is a list of general CBB-SR models numbers.

Table 1� CBB-SR Model numbers

MODEL (1) MODEL (1) MODEL (1)

315 315-M3 315-M3HW

420 420-M3 420-M3HW

520 520-M3 520-M3HW

525 525-M3 525-M3HW

725 725-M3 725-M3HW

(1) Also includes actuator models with –10 and –11 as a sufx

NOTE:

When the actuator model number has “-S” as a sufx then the actuator is special and may

have some differences that may not be included in this procedure.

1.1.2 Normal recommended service interval for this actuator series is ve years.

NOTE:

Storage time is counted as part of the service interval.

1.1.3 This procedure is applicable with the understanding that all electrical power and

pneumatic pressure has been removed from the actuator.

1.1.4 Remove all piping and mounted accessories that will interfere with the module(s)

that are to be worked on.

1.1.5 This procedure should only be implemented by a technically competent technician

who should take care to observe good workmanship practices.

1.1.6 Numbers in parentheses, ( ) indicate the bubble number (reference number) used

on the Bettis Assembly Drawing and Actuator Parts List.

1.1.7 When removing seals from seal grooves, use a commercial seal removing tool or a

small screwdriver with sharp corners rounded off.

1.1.8 Use a non-hardening thread sealant on all pipe threads.

CAUTION: APPLICATION OF THREAD SEALANT

Apply the thread sealant per the manufacture’s instructions.

Service Instructions

137465E Rev. F May 2012

Section 1: Introduction

Introduction

1.1.9 Bettis recommends that disassembly of the actuator should be done in a clean

area on a workbench.

1�2 Definitions

WARNING:

If not observed, user incurs a high risk of severe damage to actuator and/or fatal injury to

personnel.

CAUTION:

If not observed, user may incur damage to actuator and/or injury to personnel.

NOTE:

Advisory and information comments provided to assist maintenance personnel to carry out

maintenance procedures.

NOTE:

This product is only intended for use in large-scale xed installations excluded from the

scope of Directive 2011/65/EU on the restriction of the use of certain hazardous substances

in electrical and electronic equipment (RoHS 2).

M3: ES:

Jackscrew or jackscrew assembly. Extended Stop(s)

1�3 General safety information

1.3.1 Products supplied by Bettis, in its “as shipped” condition, are intrinsically safe if the

instructions contained within this Service Instruction are strictly adhered to and

executed by well trained, equipped, prepared and competent personnel.

WARNING:

For the protection of personnel working on Bettis actuators, this procedure should be

reviewed and implemented for safe disassembly and reassembly. Close attention should be

noted to the WARNINGS, CAUTIONS and NOTES contained in this procedure.

WARNING:

This procedure should not supersede or replace any customer’s plant safety or work

procedures. If a conict arises between this procedure and the customer’s procedures the

differences should be resolved in writing between an authorized customers representative

and an authorized Bettis representative.

May 2012

Service Instructions

137465E Rev. F

Section 1: Introduction

Introduction

1�4 Bettis reference materials

1.4.1 CBBXXX Assembly Drawing use part number 152230.

1.4.2 CBBXXX-M3HW Assembly Drawing use part number 152608.

1�5 Service support items

1.5.1 Bettis Service Kit.

1.5.2 Commercial leak testing solution.

1.5.3 Non-hardening thread sealant.

1�6 Lubrication requirements

1.6.1 The actuator should be re-lubricated at the beginning of each service interval

using the following recommended lubricants.

NOTE:

Lubricants other than those listed in steps 1.6.2 should not be used without prior written ap-

proval of Bettis Product Engineering. The lubricant item number on some assembly drawings is

item (5) while the Bettis service kits lubricant item number is item number (500).

1.6.2 All temperature services (-50°F to +350°F)/(-45.5°C to 176.6°C) use Bettis ESL-5

lubricant. ESL-5 lubricant is contained in the Bettis Module Service Kit in tubes and

the tubes are marked ESL-4,5 & 10 lubricant.

1�7 General tool information

1.7.1 All threads on CBB series actuators are Inch Unied and NPT.

1.7.2 All tools/Hexagons are American Standard inch. Two adjustable wrenches, Allen

wrench set, small standard screwdriver with sharp edges rounded off, medium size

standard screwdriver, diagonal cutting pliers, external snap ring pliers, at le, drive

ratchet / deepwell socket set and torque wrench (up to 2,000 inch pounds / 226 N-m).

Service Instructions

137465E Rev. F May 2012

Section 1: Introduction

Introduction

1�8 Actuator weight

Table 2� Actuator weight

Actuator

Model Approximate weight (3) Actuator

Model Approximate weight (3)

CBB LB KG CBB LB KG

315-SR40 (1) 22 10.0 520-SR40 (1) 45 20.4

315-SR60 (1) 23 10.4 520-SR60 (1) 48 21.8

315-SR80 (1) 26 11.8 520-SR80 (1) 49 22.2

315-SR100 (1) 25 11.4 520-SR100 (1) 53 24.0

415-SR40 (1) 27 12.2 525-SR40 (2) 62 28.1

415-SR60 (1) 29 13.2 525-SR60 (2) 65 29.5

415-SR80 (1) 30 13.6 525-SR80 (2) 65 29.5

415-SR100 (1) 31 14.1 525-SR100 (2) 67 30.4

420-SR40 (1) 37 16.8 725-SR40 (2) 97 44.0

420-SR60 (1) 39 17.7 725-SR60 (2) 98 44.5

420-SR80 (1) 40 18.1 725-SR80 (2) 104 47.2

420-SR100 (1) 41 18.6 725-SR100 (2) 107 48.5

(1) When model has -M3HW add 2.0 pounds / 0.9 kilograms.

(2) When model has -M3HW add 4.0 pounds / 1.8 kilograms.

(3) Weight is for bare actuator without accessories or valve adaptation.

May 2012

Service Instructions

137465E Rev. F

Section 2: Actuator Disassembly

Actuator Disassembly

Section 2: Actuator disassembly

2�1 General disassembly

WARNING: DANGEROUS GAS AND/OR LIQUIDS

It is possible, that the actuator may contain a dangerous gas and/or liquids. Ensure that all

proper measures have been taken to prevent exposure or release of these types of contami-

nants before commencing any work.

CAUTION: PRESSURE

Pressure applied to the actuator is not to exceed the maximum operating pressure rating

listed on the actuator name tag.

NOTE:

Before starting the general disassembly of the actuator it is a good practice to operate

actuator with the pressure used by the customer to operate the actuator during normal

operation. Notate and record any abnormal symptoms such as jerky or erratic operation.

2.1.1 Remove all operating pressure from actuator, allowing the spring to stroke. The

spring will rotate the yoke to its fail position.

2.1.2 Record the settings of stop screw / ES / M3 jackscrews (1-70) and stop screw / ES

(4-30) before they are loosened or removed.

NOTE:

In place of stop screws the actuator may be equipped with one or two ES (ES = Extended

Stops) or one M3/M3HW (1-70) located on outboard end of housing (1-10).

Service Instructions

137465E Rev. F May 2012

Section 2: Actuator Disassembly

Actuator Disassembly

2�2 Spring cylinder disassembly

NOTE:

Review Section 2 steps 2.1.1 through 2.1.2 before proceeding with cylinder disassembly.

CAUTION: SPRINGS ARE PRELOADED

The spring in CBB Series Spring Return Actuators are preloaded.

WARNING: POTENTIALLY DANGEROUS DISASSEMBLY

Actuator must be disassembled in the following manner.

2.2.1 Remove hex nut (1-80) as follows: CBB315 through 725 standard housing stop

screw or extended stop (ES) use step 2.2.1.1. CBB315-SR-M3/M3HW through

CBB725-SR-M3/M3HW use step 2.2.1.2.

2.2.1.1 For CBB315 through 725 housing stop screw or extended stop screw

(ES):

2.2.1.1.1 Loosen and remove hex nut (1-80) and washer (1-90) from stop

screw (1-70) located in housing (1-10).

2.2.1.1.2 Remove stop screw (1-70) located in housing (1-10).

2.2.1.2 For CBB315/420/520/525/725-SR-M3 or M3HW:

2.2.1.2.1 Remove retainer ring (12-30) and groove pin (12-20) from

optional hex drive hub or from hand wheel (12-10).

2.2.1.2.2 Remove optional hex drive hub or handwheel (12-10) from M3

jackscrew (1-70).

2.2.1.2.3 Loosen and remove hex nut (1-80) from M3 jackscrew (1-70).

NOTE:

CBB420,520,525,725-SR-M3 or M3HW models: the M3 jackscrew (1-70) can not be removed now.

The M3 jackscrew used in these models can be removed later in this procedure per step 2.3.7.

2.2.2 Loosen and remove hex nut (4-40) and washer (4-90) from end cap stop screw

(4-30) or from end cap extended stop (4-30).

NOTE:

Extended stop or end cap stop screw (4-30) does not require removal from end cap (4-20)

unless replacing with a new extended stop or stop screw.

2.2.3 Remove breather (30) from end cap (4-20).

2.2.4 Remove acorn nut (8-20) and gasket seal (5-50) from end cap (4-20).

2.2.5 Use a ratchet and socket on the welded nut, located on the housing end of center bar

assembly (8-10), rotate center bar assembly (8-10) counter-clockwise (CCW). This

will cause end cap (4-20) to gradually unscrew from center bar assembly (8-10).

May 2012

Service Instructions

137465E Rev. F

Section 2: Actuator Disassembly

Actuator Disassembly

NOTE:

The end cap (4-20) can be held in position by holding the end cap (4-20) with an adjustable

wrench.

2.2.6 Continue to rotate center bar assembly (8-10) counter-clockwise (CCW) until the

spring preload is eliminated. As preload is reduced it may be necessary to keep end

cap (4-20) from turning.

2.2.7 After the spring preload is eliminated, unscrew and remove end cap (4-20) from

center bar assembly (8-10).

2.2.8 Remove spring (4-70) from within spring cylinder (4-10).

2.2.9 Hold torque shaft (1-30) and pull spring cylinder (4-10) away from housing (1-10);

slide spring cylinder over piston (4-50) and remove.

2.2.10 Remove spacer (1-110) from center bar assembly (8-10).

2.2.11 Pull piston (4-50) out of housing (1-10) and carefully slide piston off of center bar

assembly (8-10).

NOTE:

Piston (4-50) is an assembly made up of one roll pin and one yoke pin; do not attempt to

disassemble the piston assembly.

2.2.12 On models CBB415-SR, CBB520-SR, and CBB725-SR remove cylinder adapter (4-15).

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